import java.io.*;
import java.util.*;

public class Solution {

    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Scanner in = new Scanner(System.in);
        /* Parse input */
        int n = in.nextInt();
        in.nextLine();
        String steps = in.nextLine();
        /* Close scanner */
        in.close();
        /* Calculate number of valleys */
        int seaLevel = 0;  //keep track of how far above or below sea level
        boolean inValley = false;  //true when below sea level
        int numOfValleys = 0;  //keep track of completed valleys
        for (int i = 0; i < steps.length(); i++) {
            if (steps.charAt(i) == 'U') seaLevel++;
            else seaLevel--;
            // Check if below sea level, if not there already
            if (!inValley && seaLevel < 0) inValley = true;
            // Check if position is in valley and valley has ended (back up to sea level)
            else if (inValley && seaLevel == 0) {
                inValley = false;
                numOfValleys++;
            }
        }
        System.out.println(numOfValleys);
    }
}